Combination lock

Abstract

A combination lock includes a housing, amount upon which is mounted first and second slide members, and a spring plate. The first slide member carries a stop stud that engages a closing lug as the first member shifts under spring bias in a plane from an open to a closed position. The second slide member is coupled with the first member and shifts in a plane substantially parallel with that of the first member. Additionally, the second member contains recesses capable of accommodating a tumbler disc that enables shiftable motion of the second member only when a cam on the tumbler is aligned with grooves in the mount. The tumbler disc connects with toothed structure on a combination setting wheel, and the spring plate contains respective fingers for biasing the setting wheel against the tumbler and for engaging catch recesses on the setting wheel. The spring plate further contains a finger for biasing the locking lug for ejection from the housing.

What is claimed is: 
     
       1. A combination lock comprising a housing, a mount supporting a first slide member and a second slide member coupled thereto, the first slide member being capable of sliding in a plane from a first position to a second position and being biased towards the first position and having a stud capable of securing a closing lug, the second slide member capable of sliding in a plane parallel or substantially parallel to the first slide member and having one or more recesses each capable of accommodating a tumbler disc, the tumbler disc being capable of being moved by the second slide member only when a protrusion on a first face of the tumbler disc is aligned with a groove in the mount, the tumbler disc further comprising one or more than one tooth on a second face, each tooth being capable of cooperating with a respective hollow on a first face of a setting disc, wherein the combination lock further comprises a spring in the form of a plate formed of a resiliently flexible material having on one edge region one or more first finger tending to force the setting disc against the tumbler disc and one or more second finger each capable of protruding into one of a plurality of catch recesses on a second face of the setting disc, wherein the number of catch recesses corresponds to the number of secret codes on the setting disc, and wherein the opposite edge region of the plate has one or more third finger biased to act on the closing lug to tend to eject it. 
     
     
       2. A combination lock according to claim, 1, wherein the setting disc cooperates with the tumbler disc by means of a jaw clutch. 
     
     
       3. A combination lock according to claim 1, further comprising an actuation button for moving the second slide member when the protrusion on the first face of the tumbler disc is aligned with the groove in the mount. 
     
     
       4. A combination lock according to claim 1, wherein the one or more first finger and the one or more second finger act on substantially the same radial area of the setting disc, and wherein the one or more first finger is wider than the one or more second finger and is also wider than the catch recesses. 
     
     
       5. A combination lock according to claim 1, wherein a catch recess which is associated with a position corresponding to zero is longer and deeper than the other catch recesses. 
     
     
       6. A combination lock according to claim 1, wherein the plate is further constructed as a cover plate.